diff --git a/chromecast/media/audio/cast_audio_bus.cc b/chromecast/media/audio/cast_audio_bus.cc
index b70e8ccfe488c..7d8c32b765d8f 100644
--- a/chromecast/media/audio/cast_audio_bus.cc
+++ b/chromecast/media/audio/cast_audio_bus.cc
@@ -7,17 +7,25 @@
 #include <algorithm>
 #include <cstring>
 
+#include "base/check_op.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ptr_util.h"
+#include "base/numerics/checked_math.h"
 
 namespace chromecast {
 namespace media {
 
 CastAudioBus::CastAudioBus(int channels, int frames) : frames_(frames) {
-  data_.reset(new float[channels * frames]);
+  CHECK_GE(channels, 0);
+  CHECK_GE(frames, 0);
+  const size_t total = base::CheckMul(static_cast<size_t>(channels),
+                                      static_cast<size_t>(frames))
+                           .ValueOrDie();
+  data_.reset(new float[total]);
   channel_data_.reserve(channels);
   for (int i = 0; i < channels; ++i)
-    channel_data_.push_back(UNSAFE_TODO(data_.get() + i * frames));
+    channel_data_.push_back(UNSAFE_TODO(
+        data_.get() + static_cast<size_t>(i) * static_cast<size_t>(frames)));
 }
 
 CastAudioBus::~CastAudioBus() = default;
@@ -28,7 +36,9 @@ std::unique_ptr<CastAudioBus> CastAudioBus::Create(int channels, int frames) {
 }
 
 void CastAudioBus::Zero() {
-  std::fill_n(data_.get(), frames() * channels(), 0);
+  std::fill_n(data_.get(),
+              static_cast<size_t>(frames()) * static_cast<size_t>(channels()),
+              0);
 }
 
 }  // namespace media